JPH11270505A - Hydraulic control circuit in expansion arm type deep-hole excavator - Google Patents
Hydraulic control circuit in expansion arm type deep-hole excavatorInfo
- Publication number
- JPH11270505A JPH11270505A JP7608498A JP7608498A JPH11270505A JP H11270505 A JPH11270505 A JP H11270505A JP 7608498 A JP7608498 A JP 7608498A JP 7608498 A JP7608498 A JP 7608498A JP H11270505 A JPH11270505 A JP H11270505A
- Authority
- JP
- Japan
- Prior art keywords
- pressure reducing
- expansion
- stroke
- telescopic arm
- contraction
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Operation Control Of Excavators (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】この発明は、伸縮アーム式深
穴掘削機における油圧制御回路に関するものであり、特
に、伸縮アームの行程端における衝撃を緩和するための
油圧制御回路に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic control circuit for a telescopic arm type deep hole excavator, and more particularly to a hydraulic control circuit for mitigating an impact at a stroke end of a telescopic arm.
【０００２】[0002]
【発明が解決しようとする課題】多段伸縮アームを油圧
シリンダにて伸縮駆動する伸縮アーム式深穴掘削機にお
いては、伸縮アームの伸縮速度が掘削能率に関係し、伸
縮速度を可及的に高速化することが望ましいが、伸縮ア
ームの質量が大きいことから伸縮速度の高速化に伴っ
て、行程の終端で停止する際の衝撃が増大するという問
題がある。In a telescopic arm-type deep hole excavator in which a multi-stage telescopic arm is driven to expand and contract by a hydraulic cylinder, the telescopic speed of the telescopic arm is related to excavation efficiency, and the telescopic speed is as high as possible. However, since the mass of the telescopic arm is large, there is a problem that the impact at the time of stopping at the end of the stroke increases as the telescopic speed increases.
【０００３】停止時の衝撃を緩衝する手段としては、油
圧シリンダ内の両端部にエンドクッションを設け、行程
終端のピストン速度をエンドクッションにより減速させ
て衝撃を緩和するように構成したものが知られている
が、ピストンがエンドクッションに突入して減速する際
にシリンダ内の油圧が急激に上昇し、油圧シリンダの消
耗を加速させ、内部機構の破損を招くこともある。As means for buffering the shock at the time of stoppage, there is known a structure in which end cushions are provided at both ends in a hydraulic cylinder and the piston speed at the end of the stroke is reduced by the end cushion to reduce the shock. However, when the piston enters the end cushion and decelerates, the hydraulic pressure in the cylinder rises sharply, which accelerates the consumption of the hydraulic cylinder and may cause damage to the internal mechanism.
【０００４】そこで、油圧シリンダに過負荷を与えるこ
となく行程終端の衝撃を緩和できるようにして、伸縮ア
ーム式深穴掘削機の耐久性と作業性を向上するために解
決すべき技術的課題が生じてくるのであり、本発明は上
記課題を解決することを目的とする。Therefore, there is a technical problem to be solved in order to improve the durability and workability of the telescopic arm type deep hole excavator so that the impact at the end of the stroke can be reduced without overloading the hydraulic cylinder. The present invention aims to solve the above problems.
【０００５】[0005]
【課題を解決するための手段】この発明は、上記目的を
達成するために提案するものであり、油圧シリンダによ
り伸縮駆動される伸縮アームと、前記油圧シリンダを制
御する方向制御弁と、方向制御弁をパイロット操作する
リモートコントロール弁を備えた伸縮アーム式深穴掘削
機において、伸縮アームにスイッチまたはセンサと被検
出部材とからなる二組の行程検出機構を設け、一方の伸
長行程検出機構は、伸長行程端から一定範囲で検出信号
を出力し、他方の収縮行程検出機構は、収縮行程端から
一定範囲で検出信号を出力するように形成するととも
に、前記方向制御弁とリモートコントロール弁を接続す
る伸長側パイロット管路と収縮側パイロット管路のそれ
ぞれに、減圧解除と減圧動作とに切換え可能な切換式減
圧弁を設け、伸長行程検出機構の検出信号により伸長側
パイロット管路の切換式減圧弁が減圧動作状態に切換わ
り、収縮行程検出機構の検出信号により収縮側パイロッ
ト管路の切換式減圧弁が減圧動作状態に切換わる制御手
段を設け、行程端近傍における油圧シリンダ及び伸縮ア
ームの伸縮速度を減速させるようにした伸縮アーム式深
穴掘削機における油圧制御回路を提供するものである。SUMMARY OF THE INVENTION The present invention is proposed to achieve the above object, and includes a telescopic arm driven by a hydraulic cylinder, a directional control valve for controlling the hydraulic cylinder, and a directional control valve. In a telescopic arm type deep hole excavator equipped with a remote control valve for pilot-operating a valve, a telescopic arm is provided with two sets of stroke detection mechanisms including a switch or a sensor and a detected member, and one of the extension stroke detection mechanisms is: A detection signal is output within a certain range from the end of the extension stroke, and the other contraction stroke detection mechanism is configured to output a detection signal within a certain range from the end of the contraction stroke, and connects the directional control valve and the remote control valve. Each of the expansion-side pilot line and the contraction-side pilot line is provided with a switching-type pressure reducing valve that can switch between pressure reduction release and pressure reduction operation. Control by which the switching type pressure reducing valve of the expansion side pilot line is switched to the pressure reducing operation state by the detection signal of the detection mechanism, and control by which the switching type pressure reducing valve of the contraction side pilot line is switched to the pressure reducing operation state by the detection signal of the contraction stroke detection mechanism. Means are provided to provide a hydraulic control circuit in a telescopic arm-type deep hole excavator configured to reduce a telescopic speed of a hydraulic cylinder and a telescopic arm near a stroke end.
【０００６】[0006]
【発明の実施の形態】以下、この発明の実施の一形態を
図に従って詳述する。図１は、伸縮アーム式深穴掘削機
１を示し、下部走行体２上に搭載された上部旋回体３の
ブーム４に、三段式の伸縮アーム５が取付けられてい
る。伸縮アーム５は、内部に設けた油圧シリンダにより
伸縮駆動され、伸縮アーム５の先端に取付けたクラムシ
ェルバケット６にて地盤を掘削する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows a telescopic arm-type deep hole excavator 1, in which a three-stage telescopic arm 5 is attached to a boom 4 of an upper revolving unit 3 mounted on a lower traveling unit 2. The telescopic arm 5 is driven to expand and contract by a hydraulic cylinder provided therein, and excavates the ground with a clamshell bucket 6 attached to the tip of the telescopic arm 5.
【０００７】図２は、伸縮アーム５の長さを縮小して図
示した構成解説図であり、７はテレスコープ形の油圧シ
リンダである。伸縮アーム５は外筒８と中間筒９と内筒
１０との三段構成となっていて、外筒８と中間筒９を油
圧シリンダ７にて連結している。そして、外筒８の下端
部に二本のワイヤ１１，１２の端部を係止し、一方のワ
イヤ１１は中間筒９の上部に設けた滑車１３を経由して
内筒１０の上部に係止し、他方のワイヤ１２は中間筒９
の下部に設けた滑車１４を経由して内筒１０の上部に係
止して同期伸縮機構を構成している。即ち、外筒８と中
間筒９とに介装した油圧シリンダ７を伸長すれば、外筒
８に対する中間筒９の移動量に対して内筒１０は二倍の
移動量で中間筒９と内筒１０とが連動して伸びる。尚、
油圧シリンダ７並びに滑車１３，１４による送り機構に
ついては種々の形式のものが知られており、図示した形
式に限定するものではない。FIG. 2 is an explanatory diagram showing the configuration in which the length of the telescopic arm 5 is reduced, and reference numeral 7 denotes a telescope type hydraulic cylinder. The telescopic arm 5 has a three-stage configuration of an outer cylinder 8, an intermediate cylinder 9, and an inner cylinder 10, and the outer cylinder 8 and the intermediate cylinder 9 are connected by a hydraulic cylinder 7. The ends of the two wires 11 and 12 are locked to the lower end of the outer cylinder 8, and one of the wires 11 is engaged with the upper part of the inner cylinder 10 via the pulley 13 provided on the upper part of the intermediate cylinder 9. And the other wire 12 is
Is locked to the upper part of the inner cylinder 10 via the pulley 14 provided at the lower part of the inner cylinder 10 to constitute a synchronous expansion and contraction mechanism. That is, if the hydraulic cylinder 7 interposed between the outer cylinder 8 and the intermediate cylinder 9 is extended, the inner cylinder 10 moves twice as much as the inner cylinder 9 with respect to the movement of the intermediate cylinder 9 with respect to the outer cylinder 8. The tube 10 extends in conjunction with the tube 10. still,
Various types of feed mechanisms using the hydraulic cylinder 7 and the pulleys 13 and 14 are known, and are not limited to the illustrated types.
【０００８】そして、外筒８の下端部位とそのやや上方
に上昇側減速領域検出用近接センサ１５と下降側減速領
域検出用近接センサ１６を中間筒９に向けて取付け、こ
れら二つのセンサ１５，１６を、後述する油圧制御回路
の制御部に接続している。また、中間筒９の下部外周面
に上昇位置検出用凸部１７を設け、上部外周面に下降位
置検出用凸部１８を設けて、近接センサ１５，１６と凸
部１７，１８とにより伸縮アーム５の行程検出機構を構
成している。尚、行程検出機構は近接センサ１５，１６
に代えてリミットスイッチと凸部１７，１８とによって
構成してもよい。A proximity sensor 15 for detecting a deceleration area on the ascending side and a proximity sensor 16 for detecting a deceleration area on the descending side are mounted on the lower end portion of the outer cylinder 8 and slightly above the lower end portion toward the intermediate cylinder 9. 16 is connected to a control unit of a hydraulic control circuit described later. Further, a protrusion 17 for detecting a rising position is provided on a lower outer peripheral surface of the intermediate cylinder 9 and a protrusion 18 for detecting a lowering position is provided on an upper outer peripheral surface. 5 constitutes the stroke detection mechanism. In addition, the stroke detecting mechanism includes the proximity sensors 15 and 16.
Instead of the limit switch and the projections 17 and 18.
【０００９】同図に示す伸縮アーム５の最収縮位置にお
いては、上昇側減速領域検出用近接センサ１５（以下、
単に上昇検出センサという）が上昇位置検出用凸部１７
の下端近傍に対向して、上昇検出センサ１５からオン信
号が出力されている。そして、油圧シリンダ７を伸長し
て中間筒９がある程度下降し、上昇位置検出用凸部１７
が上昇検出センサ１５の前面の検出範囲から外れると、
上昇検出センサ１５の出力信号はオフする。伸縮アーム
５が下降行程の終端に近づき、下降位置検出用凸部１８
が下降側減速領域検出用近接センサ１６（以下、下降検
出センサという）の前面の検出範囲に入ると、下降検出
センサ１６から減速領域進入を示すオン信号が出力され
る。At the most contracted position of the telescopic arm 5 shown in FIG.
(Hereinafter simply referred to as a rise detection sensor).
A turn-on signal is output from the rise detection sensor 15 so as to face the vicinity of the lower end. Then, the intermediate cylinder 9 is lowered to some extent by extending the hydraulic cylinder 7, and the raised position detecting convex portion 17 is formed.
Is out of the detection range on the front of the rise detection sensor 15,
The output signal of the rise detection sensor 15 turns off. When the telescopic arm 5 approaches the end of the descending stroke, the descending position detecting projection 18
Is in the detection range on the front of the descending deceleration area detecting proximity sensor 16 (hereinafter, referred to as the descent detection sensor), the down detection sensor 16 outputs an ON signal indicating entry into the deceleration area.
【００１０】また、上昇行程においても、伸縮アーム５
が上昇行程の終端に近づいて、上昇位置検出用凸部１７
が上昇検出センサ１５の前面の検出範囲に入ったときに
上昇検出センサ１５からオン信号が出力される。[0010] Further, the telescopic arm 5 is also used during the ascent stroke.
Approaches the end of the ascending stroke, and the ascending position detecting protrusion 17
Rise sensor 15 outputs an ON signal when it enters the detection range on the front of the rise detection sensor 15.
【００１１】このように、下降と上昇の両行程において
行程の終端の直前から終端まで下降検出センサ１６また
は上昇検出センサ１５からオン信号が出力される。図３
は、伸縮アーム５の油圧制御回路を示し、深穴掘削機１
のキャビン内の伸縮アーム操作ペダル１９によって操作
されるリモートコントロール弁２０と、コントロールバ
ルブユニット（図示せず）内の伸縮アーム用方向制御弁
２１（以下、単に方向制御弁という）のパイロット受圧
室２１ａ，２１ｂは収縮側パイロット管路２２と伸長側
パイロット管路２３によって接続され、収縮側パイロッ
ト管路２２と伸長側パイロット管路２３のそれぞれに切
換え式減圧弁２４，２５が挿入されている。As described above, in both the descending and ascending strokes, the ON signal is output from the descending detection sensor 16 or the ascending detection sensor 15 from immediately before the end of the stroke to the end. FIG.
Shows a hydraulic control circuit of the telescopic arm 5, and the deep hole excavator 1
And a pilot pressure receiving chamber 21a of a telescopic arm directional control valve 21 (hereinafter simply referred to as a directional control valve) in a control valve unit (not shown). , 21b are connected by a contraction-side pilot line 22 and an extension-side pilot line 23, and switchable pressure reducing valves 24, 25 are inserted into the contraction-side pilot line 22 and the extension-side pilot line 23, respectively.
【００１２】切換え式減圧弁２４，２５は，それぞれソ
レノイド切換弁２６，２７によってパイロット操作さ
れ、上昇検出センサ１５または下降検出センサ１６のオ
ン信号に応じて制御部２８が出力する電流によりソレノ
イド切換弁２６，２７が切換わり、切換え式減圧弁２
４，２５を開放位置に固定、または固定を解除した減圧
動作状態の何れかに切換える。The switching type pressure reducing valves 24 and 25 are pilot-operated by solenoid switching valves 26 and 27, respectively, and are operated by a current output by a control unit 28 in response to an ON signal of a rise detection sensor 15 or a fall detection sensor 16. 26, 27 are switched, switching type pressure reducing valve 2
4 and 25 are switched to either the fixed position at the open position or the decompression operation state where the fixation is released.
【００１３】伸縮アーム５が減速領域以外の行程位置に
あるときは、上昇検出センサ１５または下降検出センサ
１６の出力はオフし、ソレノイド切換弁２６，２７が開
いて切換え式減圧弁２４，２５にパイロット圧が供給さ
れる。これにより、切換え式減圧弁２４，２５は開放位
置に固定されて減圧機能は働かず、リモートコントロー
ル弁２０からのパイロット圧は減圧されずに方向制御弁
２１へ供給されるので、方向制御弁２１のスプールはリ
モートコントロール弁２０の操作に応じてフルストロー
ク可能である。When the telescopic arm 5 is at a stroke position other than the deceleration range, the output of the ascent detecting sensor 15 or the descending detecting sensor 16 is turned off, and the solenoid switching valves 26 and 27 are opened to switch to the switching type pressure reducing valves 24 and 25. Pilot pressure is supplied. As a result, the switching type pressure reducing valves 24 and 25 are fixed to the open positions, the pressure reducing function does not work, and the pilot pressure from the remote control valve 20 is supplied to the direction control valve 21 without being reduced. The full spool can be operated in accordance with the operation of the remote control valve 20.
【００１４】一方、伸縮アーム５が行程端に近づいて減
速領域に入り、上昇検出センサ１５または下降検出セン
サ１６の出力がオンになると、ソレノイド切換弁２６ま
たは２７が閉鎖位置に切換わり、切換え式減圧弁２４ま
たは２５を開放位置に固定しているパイロット圧が解除
され、切換え式減圧弁２４または２５が減圧弁としての
機能を発揮する。したがって、リモートコントロール弁
２０からの一次圧に対して切換え式減圧弁２４または２
５以降の二次圧が低下し、方向制御弁２１のスプールは
二次圧に応じたストローク位置となり、ストローク範囲
が縮小されて伸長側または収縮側にフルストロークでき
なくなる。On the other hand, when the telescopic arm 5 approaches the stroke end and enters the deceleration region and the output of the ascent detection sensor 15 or the descent detection sensor 16 is turned on, the solenoid switching valve 26 or 27 is switched to the closed position, and the switching type is switched. The pilot pressure fixing the pressure reducing valve 24 or 25 to the open position is released, and the switching type pressure reducing valve 24 or 25 functions as a pressure reducing valve. Therefore, for the primary pressure from the remote control valve 20, the switching type pressure reducing valve 24 or 2
The secondary pressure after 5 decreases, and the spool of the directional control valve 21 comes to a stroke position corresponding to the secondary pressure, and the stroke range is reduced, so that the full stroke cannot be performed on the extension side or the contraction side.
【００１５】例えば、リモートコントロール弁２０を下
げ側に操作すると、パイロットポンプ２９からの圧油が
方向制御弁２１の下げ側受圧室２１ｂに作用し、方向制
御弁２１のスプールが下げ側にストロークし、メインポ
ンプ３０からの圧油を油圧シリンダ７に送り伸縮アーム
５が伸びる。For example, when the remote control valve 20 is operated to the lower side, the pressure oil from the pilot pump 29 acts on the lower pressure receiving chamber 21b of the directional control valve 21, and the spool of the directional control valve 21 strokes to the lower side. Then, the pressure oil from the main pump 30 is sent to the hydraulic cylinder 7, and the telescopic arm 5 is extended.
【００１６】伸縮アーム５が伸長して、行程終端の近傍
で下降検出センサ１６が下降位置検出用凸部１８を検出
したときに、下降検出センサ１６からオン信号が出力さ
れ、伸長側パイロット管路２３の切換え式減圧弁２５が
減圧位置に切換わり、二次圧が低下する。これにより、
方向制御弁２１のスプールは減圧された二次圧に応じた
ストローク位置に移動し、油圧シリンダ７への供給油量
が減じられて油圧シリンダ７の伸縮速度が減速される。
この減速状態は下降検出センサ１６が下降位置検出用凸
部１８を検出している間持続し、伸縮アーム５は行程終
端まで減速状態で進み、行程終端で停止する際の衝撃が
緩和される。When the extendable arm 5 is extended and the descending detection sensor 16 detects the descending position detecting convex portion 18 near the end of the stroke, an ON signal is output from the descending detection sensor 16 and the extension side pilot line is output. The switchable pressure reducing valve 25 switches to the pressure reducing position, and the secondary pressure decreases. This allows
The spool of the direction control valve 21 moves to a stroke position corresponding to the reduced secondary pressure, the amount of oil supplied to the hydraulic cylinder 7 is reduced, and the expansion and contraction speed of the hydraulic cylinder 7 is reduced.
This deceleration state continues while the descent detecting sensor 16 detects the descent position detecting projection 18, and the telescopic arm 5 advances in a decelerated state until the end of the stroke, and the impact when stopping at the end of the stroke is reduced.
【００１７】また、伸縮アーム５を上昇させる場合も、
上記の下げ行程と同様に、上昇行程終端の近傍で上昇検
出センサ１５が上昇位置検出用凸部１７を検出したとき
に、収縮側パイロット管路２２の切換え式減圧弁２４が
減圧動作に入り、油圧シリンダ７への供給油量が減少し
て油圧シリンダ７の収縮速度が減速され、行程終端で停
止する際の衝撃は極めて低下する。When the telescopic arm 5 is raised,
Similarly to the above-described downward stroke, when the upward detection sensor 15 detects the upward position detecting convex portion 17 near the end of the upward stroke, the switching type pressure reducing valve 24 of the contraction-side pilot pipeline 22 starts the pressure reducing operation, The amount of oil supplied to the hydraulic cylinder 7 is reduced, the contraction speed of the hydraulic cylinder 7 is reduced, and the impact when stopping at the end of the stroke is extremely reduced.
【００１８】尚、減速領域の範囲は、図２に示した上昇
位置検出用凸部１７並びに下降位置検出用凸部１８の上
下方向の寸法によって変更できる。また、切換え式減圧
弁２４，２５の二次圧設定により減速比が変化し、油圧
シリンダ７の高速動作速度と減速動作速度のバランスを
任意に設定することができる。The range of the deceleration area can be changed by the vertical dimension of the raised position detecting convex portion 17 and the lowered position detecting convex portion 18 shown in FIG. Further, the reduction ratio changes by setting the secondary pressure of the switching type pressure reducing valves 24 and 25, and the balance between the high speed operation speed and the deceleration operation speed of the hydraulic cylinder 7 can be arbitrarily set.
【００１９】尚、この発明は上記の実施形態に限定する
ものではなく、この発明の技術的範囲内において種々の
改変が可能であり、この発明がそれらの改変されたもの
に及ぶことは当然である。It should be noted that the present invention is not limited to the above-described embodiment, and various modifications are possible within the technical scope of the present invention, and it goes without saying that the present invention extends to those modifications. is there.
【００２０】[0020]
【発明の効果】以上説明したように、本発明は、伸縮ア
ームの行程終端の直前に油圧シリンダへの供給油量を減
少して伸縮速度を減速させるので、行程終端の衝撃を緩
和でき、従来のエンドクッションにより減速させるもの
とは異なり、減速の際に油圧シリンダ内の油圧が急激に
上昇することがなく、円滑に減速させることができる。
したがって、油圧シリンダの消耗や破損を招く虞れが解
消され、伸縮アーム式深穴掘削機の耐久性と作業性の向
上に寄与できる。As described above, according to the present invention, since the amount of oil supplied to the hydraulic cylinder is reduced immediately before the end of the stroke of the telescopic arm to reduce the expansion / contraction speed, the impact at the end of the stroke can be reduced. Unlike the case of decelerating by the end cushion, the hydraulic pressure in the hydraulic cylinder does not rise sharply at the time of deceleration, and can be decelerated smoothly.
Therefore, there is no fear that the hydraulic cylinder is worn out or damaged, and the durability and workability of the telescopic arm type deep hole excavator can be improved.
【図１】伸縮アーム式深穴掘削機の側面図。FIG. 1 is a side view of a telescopic arm type deep hole excavator.
【図２】本発明の実施形態を示し、深穴掘削機の伸縮ア
ームの構成解説図。FIG. 2 shows an embodiment of the present invention and is a configuration explanatory view of a telescopic arm of a deep hole excavator.
【図３】本発明の油圧制御回路の回路図。FIG. 3 is a circuit diagram of a hydraulic control circuit according to the present invention.
１ 伸縮アーム式深穴掘削機 ５ 伸縮アーム ７ 油圧シリンダ ８ 外筒 ９ 中間筒 １０ 内筒 １５ 上昇側減速領域検出用近接センサ １６ 下降側減速領域検出用近接センサ １７ 上昇位置検出用凸部 １８ 下降位置検出用凸部 ２１ 伸縮アーム用方向制御弁 ２２ 収縮側パイロット管路 ２３ 伸長側パイロット管路 ２４ 収縮側切換え式減圧弁 ２５ 伸長側切換え式減圧弁 ２６ 収縮側ソレノイド切換弁 ２７ 伸長側ソレノイド切換弁 ２８ 制御部 REFERENCE SIGNS LIST 1 Telescopic arm type deep hole excavator 5 Telescopic arm 7 Hydraulic cylinder 8 Outer cylinder 9 Intermediate cylinder 10 Inner cylinder 15 Proximity sensor for detecting deceleration area on ascending side 16 Proximity sensor for detecting deceleration area on descending side 17 Protrusion for ascending position detection 18 Descending Position detecting projection 21 Direction control valve for telescopic arm 22 Contraction side pilot line 23 Extension side pilot line 24 Contraction side switching type pressure reducing valve 25 Extension side switching type pressure reducing valve 26 Contraction side solenoid switching valve 27 Extension side solenoid switching valve 28 Control unit
Claims (1)
アームと、前記油圧シリンダを制御する方向制御弁と、
方向制御弁をパイロット操作するリモートコントロール
弁を備えた伸縮アーム式深穴掘削機において、 伸縮アームにスイッチまたはセンサと被検出部材とから
なる二組の行程検出機構を設け、一方の伸長行程検出機
構は、伸長行程端から一定範囲で検出信号を出力し、他
方の収縮行程検出機構は、収縮行程端から一定範囲で検
出信号を出力するように形成するとともに、 前記方向制御弁とリモートコントロール弁を接続する伸
長側パイロット管路と収縮側パイロット管路のそれぞれ
に、減圧解除と減圧動作とに切換え可能な切換式減圧弁
を設け、 伸長行程検出機構の検出信号により伸長側パイロット管
路の切換式減圧弁が減圧動作状態に切換わり、収縮行程
検出機構の検出信号により収縮側パイロット管路の切換
式減圧弁が減圧動作状態に切換わる制御手段を設け、 行程端近傍における油圧シリンダ及び伸縮アームの伸縮
速度を減速させるようにした伸縮アーム式深穴掘削機に
おける油圧制御回路。A telescopic arm driven to expand and contract by a hydraulic cylinder, a directional control valve for controlling the hydraulic cylinder,
In a telescopic arm type deep hole excavator equipped with a remote control valve for pilot-operating a directional control valve, a telescopic arm is provided with two sets of stroke detection mechanisms including a switch or a sensor and a member to be detected, and one extension stroke detection mechanism is provided. Outputs a detection signal in a certain range from the end of the extension stroke, and the other contraction stroke detection mechanism is formed to output a detection signal in a certain range from the end of the contraction stroke, and the directional control valve and the remote control valve. A switching pressure reducing valve that can switch between pressure reduction release and pressure reduction operation is provided for each of the expansion-side pilot line and the contraction-side pilot line to be connected, and the expansion-side pilot line is switched based on the detection signal of the expansion stroke detection mechanism. The pressure reducing valve is switched to the pressure reducing operation state, and the switching type pressure reducing valve of the contraction side pilot line is switched to the pressure reducing operation state by the detection signal of the contraction stroke detection mechanism. Hydraulic control circuit in a switched control unit is provided, the telescopic arm type and so as to slow down the expansion speed of the hydraulic cylinder and the telescopic arm in the stroke end near deep hole drilling machine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7608498A JPH11270505A (en) | 1998-03-24 | 1998-03-24 | Hydraulic control circuit in expansion arm type deep-hole excavator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7608498A JPH11270505A (en) | 1998-03-24 | 1998-03-24 | Hydraulic control circuit in expansion arm type deep-hole excavator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH11270505A true JPH11270505A (en) | 1999-10-05 |
Family
ID=13594973
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7608498A Pending JPH11270505A (en) | 1998-03-24 | 1998-03-24 | Hydraulic control circuit in expansion arm type deep-hole excavator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH11270505A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001046527A1 (en) * | 1999-12-22 | 2001-06-28 | Shin Caterpillar Mitsubishi Ltd. | Hydraulic circuit of working machine |
| JP2001241404A (en) * | 2000-03-01 | 2001-09-07 | Komatsu Ltd | Telescopic arm safty device for multistage telescopic type working machine |
| GB2369097A (en) * | 2000-09-12 | 2002-05-22 | Komatsu Mfg Co Ltd | System for reducing cylinder descent speed |
| KR20170006842A (en) * | 2015-07-10 | 2017-01-18 | 두산인프라코어 주식회사 | Control system for construction machinery and control method for construction machinery using the same |
-
1998
- 1998-03-24 JP JP7608498A patent/JPH11270505A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001046527A1 (en) * | 1999-12-22 | 2001-06-28 | Shin Caterpillar Mitsubishi Ltd. | Hydraulic circuit of working machine |
| US6557277B1 (en) | 1999-12-22 | 2003-05-06 | Shin Caterpillar Mitsubishi Ltd. | Hydraulic circuit of working machine |
| EP1447480A2 (en) * | 1999-12-22 | 2004-08-18 | Shin Caterpillar Mitsubishi Ltd. | Hydraulic circuit for working machine |
| EP1447480A3 (en) * | 1999-12-22 | 2004-08-25 | Shin Caterpillar Mitsubishi Ltd. | Hydraulic circuit for working machine |
| JP2001241404A (en) * | 2000-03-01 | 2001-09-07 | Komatsu Ltd | Telescopic arm safty device for multistage telescopic type working machine |
| GB2369097A (en) * | 2000-09-12 | 2002-05-22 | Komatsu Mfg Co Ltd | System for reducing cylinder descent speed |
| GB2369097B (en) * | 2000-09-12 | 2002-10-02 | Komatsu Mfg Co Ltd | System for controlling operation of cylinder of vehicle |
| US6568763B2 (en) | 2000-09-12 | 2003-05-27 | Komatsu Ltd. | System for controlling operation of cylinder of vehicle |
| KR20170006842A (en) * | 2015-07-10 | 2017-01-18 | 두산인프라코어 주식회사 | Control system for construction machinery and control method for construction machinery using the same |
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